I'm not sure if anyone would have the answer to this, but it seems a little odd to me that Ubuntu doesn't package the latest stable version of gdm considering gnome-shell version 3.4 was packaged in the precise release.

I know it's not a massive question, but I'm intrigued to know why this hasn't been included in the repos. I would imagine that some people want to full gnome experience and ubuntu just isn't giving it to them.

That's a great answer, thank you very much. I didn't realise how much configuring was needed to get everything running in ubuntu. I'm tempted to join the ubuntu-desktop team though to test some of the apps.
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SuperMattJul 10 '12 at 16:40